DOCSLIB.ORG

Geologic Map of the Montara Mountain and San Mateo 7-1/21 Quadrangles, San Mateo County, California Introduction Stratigraphy

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Geologic Map of the Montara Mountain and San Mateo 7-1/21 Quadrangles, San Mateo County, California Introduction Stratigraphy U.S. DEPARTMENT OF THE INTERIOR TO ACCOMPANY MAP I-2390 U.S. GEOLOGICAL SURVEY GEOLOGIC MAP OF THE MONTARA MOUNTAIN AND SAN MATEO 7-1/2 1 QUADRANGLES, SAN MATEO COUNTY, CALIFORNIA By Earl H. Pampeyan INTRODUCTION Darrow (1963), Mclaughlin (1969), Jack (1969), Pampeyan The Montara Mountain and San Mateo quadrangles (1975; 1981a, b), Helley and others (1979), Morgan span the San Francisco Peninsula and Santa Cruz (1981a), and numerous researchers studying topical Mountains in northern San Mateo County. The area stratigraphic, geologic, and geotechnical problems. In covered by this geologic map extends from precipi­ addition, a series of maps prepared in cooperation with tous cliffs and flat marine terraces along the Pacific the county of San Mateo and based on the geologic map Coast, eastward across rugged topography, to gently of San Mateo County (Brabb and Pampeyan, 1983) include sloping alluvial plains and tidal and marsh lands of San the present map area. The interested reader is referred Francisco Bay. The rugged topography is cut by several to Brabb and others (1982), Brabb (1983), Wieczorek northwest-trending linear trenches, the two most and others (1985), Thomson and Evernden (1986), Brabb prominent of which are along the San Andreas and and Olson (1986), Youd and Perkins (1987), Perkins (1987), Pilarcitos Faults. The map and adjoining areas are and Mark and Newman (1988) for information pertain­ divided into four structural blocks juxtaposed along major ing to history, slope stability, seismic shaking, liquifaction faults (fig. 1), adopting the scheme of Nilsen and Brabb potential, and faulting and seismicity in the county. For (1979): the San Francisco Bay block lying east of the information on physical and engineering properties of San Andreas Fault; the Pilarcitos block lying between the map units the reader is referred to Wentworth and the San Andreas and Pilarcitos Faults; the La Honda others (1985). block lying between the Pilarcitos and Seal Cove-San Field work for this geologic map was done in 1970- Gregorio Faults; and the Pigeon Point block lying west 1973 and 1980 (Pampeyan, 1981a, b). Some minor of the Seal Cove-San Gregorio Fault. In this area the additions and revisions were made in 1982, but numer­ Pilarcitos Fault marks the boundary between Salinian ous changes caused by post-1980 grading operations in granitic basement of the La Honda and Pigeon Point connection with urban development are not shown. blocks and Franciscan Complex basement of the Pilarcitos and San Francisco Bay blocks, each of which is overlain by Cenozoic coarse- to fine-grained clastic sedimen­ STRATIGRAPHY tary units. On the geologic map the San Andreas, PRE-CRETACEOUS ROCKS Pilarcitos, and Seal Cove Faults are indicated by a single The oldest(?) rocks present in the map area are small line representing the most prominent and most recently pendants of metasedimentary rock (unit pKm) in the granitic active trace in the respective zones of faulting. rock of Montara Mountain (unit Km). One pendant near Most of the bayside flatland area has been covered the south-central edge of the map area, is marble; the with residential and commercial developments so that only other pendants, near the south edge of the map area vestiges of historic alluvial deposits and tidal and marsh in El Granada, consist of three lenses of schist and hornfels. lands remain. San Andreas and Crystal Springs Lakes No other pendants were seen in the granitic terrane, are rnan-made reservoirs in San Andreas and Crystal Springs although others may be present beneath the mantle of Valleys, and Pilarcitos Lake is a man-made reservoir on surficial deposits. Lawson (1914) correlated the marble Pilarcitos Creek. These lakes and the surrounding watershed with the Paleozoic(?) Gabilan Limestone in Monterey lands are part of the water supply system for the city County, a dubious correlation at best. Lacking diagnostic and county of San Francisco. The watershed, also a state data, the pendants are considered to be remnants of a fish and game refuge, is largely undeveloped except for pre-Cretaceous sedimentary unit. facilities of the San Francisco Water Department. The coastal side of the San Francisco Peninsula contains open­ JURASSIC AND CRETACEOUS ROCKS space land as well as pockets of dense urbanization, but Sedimentary and igneous rocks of the Franciscan development there has been limited by poor access, Complex, most of which are metamorphosed to some inadequate utility facilities, and California Coastal Zone degree, are the next oldest units in the map area, and restrictions. Municipalities in the map area include Pacifica, they form the basement of the Pilarcitos and San Fran­ San Bruno, Millbrae, Burlingame, Hillsborough, San Mateo, cisco Bay blocks. They are considered to be Jurassic Foster City, Belmont, San Carlos, Redwood City, and and Cretaceous in age though no Jurassic index fossils unincorporated districts of Montara, Moss Beach, and are known from this area. In the Pilarcitos block the El Granada (fig. 2). dominant Franciscan units are greenstone (unit fg) and Geologic maps of all or parts of the present map sandstone (graywacke) (unit fs), with a band of sheared area have been prepared by Lawson (1914), Glen (1959), rock (unit fsr) along the Pilarcitos Fault. Limestone. 1 \ .. 37"45' ~ 7~ C). .U">,....., "-b \ \ ~ \ 7.L \ \ \ San Francisco' ~ay block \,Redwood Point \Quadrangle La Honda block 0 5 10 MILES Figure 1. Map showing relation of study area (horizontal lines) to major tectonic bound­ aries of the northern Santa Cruz Mountains. Diagonal-lined area is Palo Alto and part of the Redwood Point quadrangles (Pampeyan, 1993). 2 122°30' 122°22'30" 37" 37'30" 37° 30' Figure 2. Geographic map of study area and vicinity. serpentinite, conglomerate, chert, and glaucophane schist, volcanic rock to the south in the adjoining Santa Cruz in decreasing order of abundance, also are present. 30' quadrangle (Haehl and Arnold, 1904; Branner and Greenstone in the northern part of the map area is largely others, 1909). The basaltic rocks that I saw on Belmont agglomerate, flow-breccia, and tuff; in the southern part Hill had no lithologic resemblance to Miocene basalt to of the map area, greenstone consists of flows with or the south (Pampeyan, 1970, 1993) or elsewhere in San without pillow structure. The greenstone unit appears Mateo County (Brabb and Pampeyan, 1983), they were to be interbedded with graywacke, though the structure Franciscan greenstone. may be more complex than described by Lawson (1914). Rhythmically bedded, grayish-red to dark-brown In the San Francisco Bay block, sheared rock (unit fsr) radiolarian chert interlayered with graywacke and greenstone of the Franciscan Complex is the dominant unit. It contains is well exposed in San Carlos, Belmont, central San Mateo, tectonic inclusions of greenstone, graywacke, glaucophane and at Coyote Point. There are other moderate-size schist, and chert scattered about in random fashion. Along exposures of chert, most of which are tectonic inclusions the east edge of the sheared-rock unit, coherent bodies in sheared rock. Many of the remaining smaller bodies of chert, graywacke, and conglomerate are present; along are yellowish-orange, grayish-green, or white, and some its southwest edge the sheared rock unit is covered by of them are recrystallized and have fractures and voids serpentinite. up to a few inches across lined with quartz crystals. Sandstone (unit fs} of the Franciscan Complex, Radiolarians from shale interbeds at the site of ANGELO commonly referred to as graywacke, is widespread in the were described by Riedel and Schlocker (1956) as hav­ Pilarcitos block where it appears to be interbedded with ing similarities with some Jurassic and Cretaceous spe­ predominantly pyroclastic greenstones. In the San Francisco cies, and a Jurassic or Cretaceous age was postulated Bay block the largest bodies of coherent graywacke border for this fauna by Bailey and others (1964). the flatlands between San Carlos and San Mateo. Tectonic Limestone bodies extend diagonally southeast across inclusions of graywacke present in the sheared rock unit the map area and, with one exception, are all in the are relatively small and not easily recognized as such in Pilarcitos block The largest body was at Rockaway Beach natural exposures. One unique tectonic inclusion of at the mouth of Calera Valley, which Lawson (1914) defined graywacke exposed during construction of Highway 92 as the type Calera Limestone Member of the Cahil near the College of San Mateo contained seams of Sandstone. More recent reports have revised the Calera anthracitic coal 2 in. thick (G.O. Gates, oral commun., as a separate formation (Brabb and others, 1982). Little 1970). of the type Calera Limestone outcrop remains today owing Northeast of Belmont Hill, between El Camino Real to quarrying operations in the area. Much of the re­ and Highway 101, a small hill underlain by conglomer­ maining limestone is interbedded with graywacke and ate, chert, and greenstone was the site of U.S. Coast greenstone, and some is surrounded by sheared rock (unit Survey (1853b, 1857b) triangulation station ANGELO. fsr). Along the west edge of Lower Crystal Springs Lawson (1914) believed that this conglomerate, and another Reservoir, many of the small bodies of limestone are small patch of conglomerate a half mile southwest of elongate parallel to the San Andreas Fault; these bod­ Belmont Hill, probably represented the Knoxville For­ ies appear to be fault slivers, but outcrops typically do mation. The small hill, later referred to as Quarry Hill, not expose details of the contact with enclosing rocks. was removed by grading about 1951 but exposures of According to W.V. Sliter (oral commun., 1991), fora­ pebble to cobble conglomerate (unit fcg} remain and minifers from the type locality of the Calera indicate an undoubtedly are part of the Franciscan Complex.
Load more

Recommended publications
  • Introduction San Andreas Fault: an Overview
    Introduction This volume is a general geology field guide to the San Andreas Fault in the San Francisco Bay Area. The first section provides a brief overview of the San Andreas Fault in context to regional California geology, the Bay Area, and earthquake history with emphasis of the section of the fault that ruptured in the Great San Francisco Earthquake of 1906. This first section also contains information useful for discussion and making field observations associated with fault- related landforms, landslides and mass-wasting features, and the plant ecology in the study region. The second section contains field trips and recommended hikes on public lands in the Santa Cruz Mountains, along the San Mateo Coast, and at Point Reyes National Seashore. These trips provide access to the San Andreas Fault and associated faults, and to significant rock exposures and landforms in the vicinity. Note that more stops are provided in each of the sections than might be possible to visit in a day. The extra material is intended to provide optional choices to visit in a region with a wealth of natural resources, and to support discussions and provide information about additional field exploration in the Santa Cruz Mountains region. An early version of the guidebook was used in conjunction with the Pacific SEPM 2004 Fall Field Trip. Selected references provide a more technical and exhaustive overview of the fault system and geology in this field area; for instance, see USGS Professional Paper 1550-E (Wells, 2004). San Andreas Fault: An Overview The catastrophe caused by the 1906 earthquake in the San Francisco region started the study of earthquakes and California geology in earnest.
    [Show full text]
  • San Francisco Bay Area Integrated Regional Water Management Plan
    San Francisco Bay Area Integrated Regional Water Management Plan October 2019 Table of Contents List of Tables ............................................................................................................................... ii List of Figures.............................................................................................................................. ii Chapter 1: Governance ............................................................................... 1-1 1.1 Background ....................................................................................... 1-1 1.2 Governance Team and Structure ...................................................... 1-1 1.2.1 Coordinating Committee ......................................................... 1-2 1.2.2 Stakeholders .......................................................................... 1-3 1.2.2.1 Identification of Stakeholder Types ....................... 1-4 1.2.3 Letter of Mutual Understandings Signatories .......................... 1-6 1.2.3.1 Alameda County Water District ............................. 1-6 1.2.3.2 Association of Bay Area Governments ................. 1-6 1.2.3.3 Bay Area Clean Water Agencies .......................... 1-6 1.2.3.4 Bay Area Water Supply and Conservation Agency ................................................................. 1-8 1.2.3.5 Contra Costa County Flood Control and Water Conservation District .................................. 1-8 1.2.3.6 Contra Costa Water District .................................. 1-9 1.2.3.7
    [Show full text]
  • Foster City, a Planned Community in the San Francisco Bay Area
    FOS T ER CI T Y - A NEW CI T Y ON T HE BAY A TRIBU T E T O PROFESSOR MI C HAEL MCDOUGALL KAL V IN PLATT As a tribute to Michael McDougall, long-time friend and colleague, Kalvin Platt revisits the Kalvin Platt, FAIA, is project for Foster City, a planned community in the San Francisco Bay Area. Mike was a Chairman of the SWA Group, an International principal planner and designer of this successful story of a new community which, as early Planning and Landscape as 1958, pioneered several planning and urban design maxims that we value today in good Architectural consulting place-making and sustainability. Foster City is a lesson for all of us. firm with 7 offices and award winning projects around the world. Mr. Platt has In the early 1960s; when I came to California as a planner and joined Wilsey, Ham, and Blair, an extensive experience Engineering and Planning Company in Millbrae; I met Michael McDougall. He was working on Foster in Planning New Towns and Communities, City, a new town along the San Francisco Bay. The sinuous “Venice-like” lagoon system that formed Sustainable Land the backbone of the plan amazed me with its inherent beauty and appropriateness to the natural Planning, Urban sloughs that ran along the Bay. What also amazed me was that this was a Master Planned New Design and Park and Town, the first significant effort of this post-WWII large scale planning concept in California and it had Conservation Planning. begun to be built as planned.
    [Show full text]
  • Section 3.4 Biological Resources 3.4- Biological Resources
    SECTION 3.4 BIOLOGICAL RESOURCES 3.4- BIOLOGICAL RESOURCES 3.4 BIOLOGICAL RESOURCES This section discusses the existing sensitive biological resources of the San Francisco Bay Estuary (the Estuary) that could be affected by project-related construction and locally increased levels of boating use, identifies potential impacts to those resources, and recommends mitigation strategies to reduce or eliminate those impacts. The Initial Study for this project identified potentially significant impacts on shorebirds and rafting waterbirds, marine mammals (harbor seals), and wetlands habitats and species. The potential for spread of invasive species also was identified as a possible impact. 3.4.1 BIOLOGICAL RESOURCES SETTING HABITATS WITHIN AND AROUND SAN FRANCISCO ESTUARY The vegetation and wildlife of bayland environments varies among geographic subregions in the bay (Figure 3.4-1), and also with the predominant land uses: urban (commercial, residential, industrial/port), urban/wildland interface, rural, and agricultural. For the purposes of discussion of biological resources, the Estuary is divided into Suisun Bay, San Pablo Bay, Central San Francisco Bay, and South San Francisco Bay (See Figure 3.4-2). The general landscape structure of the Estuary’s vegetation and habitats within the geographic scope of the WT is described below. URBAN SHORELINES Urban shorelines in the San Francisco Estuary are generally formed by artificial fill and structures armored with revetments, seawalls, rip-rap, pilings, and other structures. Waterways and embayments adjacent to urban shores are often dredged. With some important exceptions, tidal wetland vegetation and habitats adjacent to urban shores are often formed on steep slopes, and are relatively recently formed (historic infilled sediment) in narrow strips.
    [Show full text]
  • 1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California
    1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California Prepared for: Premia Capital, LLC 801 Hamilton Street Redwood City, CA Prepared by: Stantec Consulting Services, Inc. January 18, 2019 1180 MAIN STREET PROJECT, CULTURAL RESOURCES INVENTORY AND EVALUATION REPORT, REDWOOD CITY, SAN MATEO COUNTY, CALIFORNIA This document entitled 1180 Main Street Project, Cultural Resources Inventory and Evaluation Report, Redwood City, San Mateo County, California was prepared by Stantec Inc. (“Stantec”) for the account of Premia Capital, LLC (the “Client”). Any reliance on this document by any third party is strictly prohibited. The material in it reflects Stantec’s professional judgment in light of the scope, schedule and other limitations stated in the document and in the contract between Stantec and the Client. The opinions in the document are based on conditions and information existing at the time the document was published and do not take into account any subsequent changes. In preparing the document, Stantec did not verify information supplied to it by others. Any use which a third party makes of this document is the responsibility of such third party. Such third party agrees that Stantec shall not be responsible for costs or damages of any kind, if any, suffered by it or any other third party as a result of decisions made or actions taken based on this document. Prepared by (signature) Joanne Grant, Archaeologist, MA, RPA Reviewed by (signature) John A. Nadolski, M.A. Approved
    [Show full text]
  • Central Coast
    Table of Contents 1. INTRODUCTION ............................................................................................................ 1 1.1 Background ....................................................................................................................... 1 1.2 Consultation History......................................................................................................... 1 1.3 Proposed Action ............................................................................................................... 2 1.4 Action Area ..................................................................................................................... 32 2. ENDANGERED SPECIES ACT: BIOLOGICAL OPINION AND INCIDENTAL TAKE STATEMENT ......................................................................................................... 34 2.1 Analytical Approach ....................................................................................................... 34 2.2 Life History and Range-wide Status of the Species and Critical Habitat ...................... 35 2.3 Environmental Baseline .................................................................................................. 48 2.4 Effects of the Action ........................................................................................................ 62 2.5 Cumulative Effects .......................................................................................................... 76 2.6 Integration and Synthesis ..............................................................................................
    [Show full text]
  • Goga Wrfr.Pdf
    The National Park Service Water Resources Division is responsible for providing water resources management policy and guidelines, planning, technical assistance, training, and operational support to units of the National Park System. Program areas include water rights, water resources planning, regulatory guidance and review, hydrology, water quality, watershed management, watershed studies, and aquatic ecology. Technical Reports The National Park Service disseminates the results of biological, physical, and social research through the Natural Resources Technical Report Series. Natural resources inventories and monitoring activities, scientific literature reviews, bibliographies, and proceedings of technical workshops and conferences are also disseminated through this series. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the National Park Service. Copies of this report are available from the following: National Park Service (970) 225-3500 Water Resources Division 1201 Oak Ridge Drive, Suite 250 Fort Collins, CO 80525 National Park Service (303) 969-2130 Technical Information Center Denver Service Center P.O. Box 25287 Denver, CO 80225-0287 Cover photos: Top: Golden Gate Bridge, Don Weeks Middle: Rodeo Lagoon, Joel Wagner Bottom: Crissy Field, Joel Wagner ii CONTENTS Contents, iii List of Figures, iv Executive Summary, 1 Introduction, 7 Water Resources Planning, 9 Location and Demography, 11 Description of Natural Resources, 12 Climate, 12 Physiography, 12 Geology, 13 Soils, 13
    [Show full text]
  • 203287 Cov Final Vol 1.Ai
    Summary Summary SUMMARY Sections Figures Tables S.1 Introduction and Purpose of S.1 Overview of SFPUC Regional S.1 WSIP Goals and Objectives the PEIR System and Water Supply Watersheds S.2 WSIP Facility Improvement S.2 Program Description Projects S.2 SFPUC Water Service Area – S.3 Environmental Effects San Francisco and SFPUC S.3 Summary of WSIP Facility Construction and Operation S.4 Areas of Controversy and Wholesale Customers Impacts Issues to be Resolved S.3 Annual Average Historical and S.4 Summary of Facility Mitigation S.5 Required Actions and Projected Customer Purchase Measures by Impact Approvals Requests S.5 Summary of Water Supply Impacts S.6 WSIP Variants S.4 WSIP Water Supply Sources, Nondrought Years and Mitigation Measures – S.7 Alternatives to the Proposed Tuolumne River System and Program S.5 WSIP Water Supply Sources, Downstream Water Bodies Drought Years S.6 Summary of Water Supply Impacts S.6a Location of WSIP Facility and Mitigation Measures – Improvement Projects – Sunol Alameda Creek Watershed Valley, Bay Division, Peninsula, and San Francisco Regions S.7 Summary of Water Supply Impacts and Mitigation Measures – S.6b Location of WSIP Facility Peninsula Watersheds Improvement Projects – San Joaquin Region S.8 Summary of Water Supply Impacts and Mitigation Measures – S.6c Location of WSIP Facility Westside Groundwater Basin Improvement Projects – Hetch Hetchy Region S.9 Summary of Water Supply Impacts and Mitigation Measures – S.7 Preliminary WSIP Construction Cumulative Water Supply Schedule S.1 Introduction and Purpose of the PEIR (Chapter 1) The San Francisco Public Utilities Commission (SFPUC) proposes to adopt and implement the Water System Improvement Program (WSIP or proposed program) to increase the reliability of the regional water system that serves 2.4 million people in San Francisco and the San Francisco Bay Area.
    [Show full text]
  • Portolá Trail and Development of Foster City Our Vision Table of Contents to Discover the Past and Imagine the Future
    Winter 2014-2015 LaThe Journal of the SanPeninsula Mateo County Historical Association, Volume xliii, No. 1 Portolá Trail and Development of Foster City Our Vision Table of Contents To discover the past and imagine the future. Is it Time for a Portolá Trail Designation in San Mateo County? ....................... 3 by Paul O. Reimer, P.E. Our Mission Development of Foster City: A Photo Essay .................................................... 15 To enrich, excite and by T. Jack Foster, Jr. educate through understanding, preserving The San Mateo County Historical Association Board of Directors and interpreting the history Paul Barulich, Chairman; Barbara Pierce, Vice Chairwoman; Shawn DeLuna, Secretary; of San Mateo County. Dee Tolles, Treasurer; Thomas Ames; Alpio Barbara; Keith Bautista; Sandra McLellan Behling; John Blake; Elaine Breeze; David Canepa; Tracy De Leuw; Dee Eva; Ted Everett; Accredited Pat Hawkins; Mark Jamison; Peggy Bort Jones; Doug Keyston; John LaTorra; Joan by the American Alliance Levy; Emmet W. MacCorkle; Karen S. McCown; Nick Marikian; Olivia Garcia Martinez; Gene Mullin; Bob Oyster; Patrick Ryan; Paul Shepherd; John Shroyer; Bill Stronck; of Museums. Joseph Welch III; Shawn White and Mitchell P. Postel, President. President’s Advisory Board Albert A. Acena; Arthur H. Bredenbeck; John Clinton; Robert M. Desky; T. Jack Foster, The San Mateo County Jr.; Umang Gupta; Greg Munks; Phill Raiser; Cynthia L. Schreurs and John Schrup. Historical Association Leadership Council operates the San Mateo John C. Adams, Wells Fargo; Jenny Johnson, Franklin Templeton Investments; Barry County History Museum Jolette, San Mateo Credit Union and Paul Shepherd, Cargill. and Archives at the old San Mateo County Courthouse La Peninsula located in Redwood City, Carmen J.
    [Show full text]
  • USGS Professional Paper 1740
    Age, Stratigraphy, and Correlations of the Late Neogene Purisima Formation, Central California Coast Ranges By Charles L. Powell II1, John A. Barron1, Andrei M. Sarna-Wojcicki1, Joseph C. Clark2, Frank A. Perry3, Earl E. Brabb4, and Robert J. Fleck1 Abstract Counties inland to the San Andreas Fault (fig. 1). These scat- tered outcrops have been grouped as the Purisima Formation The Purisima Formation is an important upper Miocene because they are all fine- to coarse-grained clastic rocks, with and Pliocene stratigraphic unit in central California, cropping dark andesitic fragments and locally abundant silicic tephra, out from the coast at Point Reyes north of San Francisco to and occupy the same stratigraphic position at their various more extensive exposures in the Santa Cruz Mountains to the exposures. Since first described by Haehl and Arnold (1904), south. The fine-grained rocks in the lower parts of the Puri- the Purisima Formation has been considered to be of Pliocene sima Formation record a latest Miocene transgressive event, or of late Miocene to Pliocene age. Differing age assignments whereas the middle and upper parts of the formation consist have resulted from the wide stratigraphic range of many com- of increasingly clastic-rich siltstones and sandstones resulting monly encountered megafossils and from the lack of agree- from uplift of adjacent coastal regions and the Sierra Nevada ment on the placement of the Miocene-Pliocene Series bound- during Pliocene transgressive and regressive sea-level events. ary between the provincial megafaunal chronology and that Exposures of the Purisima occur in three different, fault- of international usage.
    [Show full text]
  • Ohlone-Portola Heritage Trail Statement of Significance
    State of California Natural Resources Agency Primary# DEPARTMENT OF PARKS AND RECREATION HRI # Trinomial CONTINUATION SHEET Property Name: __California Historical Landmarks Associated with the Ohlone-Portolá Heritage Trail______ Page __1___ of __36__ B10. Statement of Significance (continued): The following Statement of Significance establishes the common historic context for California Historical Landmarks associated with the October-November 1769 expedition of Gaspar de Portolá through what is now San Mateo County, as part of a larger expedition through the southern San Francisco Bay region, encountering different Ohlone communities, known as the Ohlone-Portolá Heritage Trail. This context establishes the significance of these landmark sites as California Historical Landmarks for their association with an individual having a profound influence on the history of California, Gaspar de Portolá, and a group having a profound influence on the history of California, the Ohlone people, both associated with the Portolá Expedition Camp at Expedition. This context amends seven California Historical Landmarks, and creates two new California Historical Landmark nominations. The Statement of Significance applies to the following California Historical Landmarks, updating their names and historic contexts. Each meets the requirements of California PRC 5024.1(2) regarding review of state historical landmarks preceding #770, and the criteria necessary for listing as California Historical Landmarks. Because these landmarks indicate sites with no extant
    [Show full text]
  • Rancho Corral De Tierra- Palomares
    Rancho Corral de Tierra- Palomares Biological Report & Study Compilation July, 2001 Peninsula Open Space Trust Rancho Corral de Tierra-Palomares Biological Report Contents I. Overview & Summary Biological Report Introduction 1 Physical Description 2 Landscape History 3 Geographic Location 6 Parcel Description & Topography 7 Geology and Soils 9 Climate 9 Current Biological Status Summary Biological Importance 10 Beyond the Borders 11 Unique Biological Resources Plant Communities 12 Special Status Plants 13 Animal Communities 14 Special Status Animals 15 II. Biological Description of Rancho Corral de Tierra Methodology 16 Unique Biological Communities 19 Special Status Species Key 22 Plants 23 Reptiles 30 Birds 31 Amphibians 32 Invertebrates 33 Mammals 35 Fish 35 Watershed Delineations & Resources 37 Martini creek watershed 38 Daffodil Valley drainage 41 Farallone drainage 42 Montara creek watershed 44 Sunshine Valley drainage 46 San Vicente creek watershed 47 Denniston creek watershed 50 Other watersheds and drainages 53 Alien and Invasive Species 54 List of Identified Biological Reports & Sources 58 Rancho Corral de Tierra-Palomares I. Overview As the morning mist clears along Hwy. 1, residents who commute daily and first-time travelers experience wonder as the breathtaking views are revealed around the last curve and rocky outcropping that begin the descent into Montara from Devil’s Slide. Mountain cliffs meet crashing waves as vistas of sea and mountains whiz by. Most coastside visitors, blissfully unaware of the efforts to preserve such beauty stretching along the Pacific Coast, lack an identification and understanding of this special area and the flora and fauna it supports. To enjoy and appreciate its stunning views are enough without delving into the past and its legacy.
    [Show full text]